benedict



(No Model.)

0. T. BENEDICT. REVOLVING CHAIR.

No. 583,446. Patented June 1,1897.

'UNITED STATES PATENT OFFICE.

CURTIS T. BENEDICT, OF MILWVAUKEE, \VISCONSIN.

REVOLVING CHAIR.

SPECIFICATION forming part of Letters Patent No. 583,446, dated June 1,1897.

Application filed February 1, 1897. Serial No. 621,401. (No model.)

T0 all whom it may concern:

Be it known that I, CURTIS T. BENEDICT, of Milwaukee, in the county ofMilwaukee and State of Wisconsin, have invented a new and usefulImprovement in Revolving Chairs, of which the following is adescription, reference being had to the accompanying drawings, which area part of this specification.

My invention relates to improvements in revolving chairs of the class inwhich the seat is freely revoluble on the pedestal or base, and in whichthe height of the seat can be adjusted by means of a screw-threadedspindle provided with devices by which the seat will not automaticallyrun down when used in the ordinary way as a revolving chair.

The object of the invention is to provide simple, reliable, inexpensive,and easily-0perated devices for accomplishing the purposes of chairs ofthis class.

The invention consists of the devices and their combinations, ashereinafter described and claimed, or their equivalents.

In the drawings, Figure 1 is an elevation of my improved chair-ir0n,parts being shown in section for convenience of illustration. Fig. 2 isa transverse section on line 2 2 of Fig. 1 and plan of parts below,looking downwardly from that line. Fig. 3 is a transverse section online 3 3 of Fig. 1 and of parts below, looking downwardly therefrom.Fig. 4 is a detail, partly in section, of a slightlymodified form of thelatch or stop.

In the drawings, A is the hub of the pedestal and is usually made ofmetal, provided with sockets, into which sockets the ends of thechair-legs B B are inserted, securing the legs to the hub and to eachother, forming a pedestal on which the remaining parts of the chair aresupported. This hub A is provided centrally with a smooth cylindricalbore.

A screw-threaded metal spindle C is secured at its upper end to thechair-seat which is supported thereon, the chair-seat not being shown,as the construction is the common one in revolving chairs. This spindleO fits revolubly in the smooth vertical bore in the hub Awithout regardto the screw-thread thereon. A nut D, provided with an interiorscrew-thread, fits and turns by its thread on the spindle O and restsrevolubly on the hub A. This nut D is preferably provided with shortradially-projecting fingers E E, to be conveniently grasped by the userof the chair for readily turning the nut on the spindle to elevate orlower the spindle in the nut. An annular flange or a hand-Wheel could beused on the nut for this purpose, but the projections or fingers arepreferred, as they can be cast integrally with the nut and serve thepurpose of a means for holding the nut while turning the spindle in itor for turning the nut on the spindle, substantially as well asahand-wheel or annular flange.

It will be understood that the nut D and the spindle O are to beadjusted by means of their screw-threads to proper positions withreference to each other to place the chairseat at a desired height, andfor the purpose of securing the nut to the spindle against therevolution of either with reference to the other, when the desiredheight of the chairseat has been obtained, I provide a latch or stop F,which is pivoted so as to swing radially with reference to the spindlein a recess therefor in the nut D, the latch or stop being adapted toenter a recess or, preferably, a

longitudinal groove G therefor in the spindle O. This latch or stopsecures the nut D and spindle C in constant position with reference toeach other revolubly while the latch or stop is in the groove or recessG, but permits their relative adjustment when it is swung out ofengagement with the spindle. It will be noticed that the construction issuch that the latch or stop by gravity automatically remains in or outof engagement with the spindle in accordance with whichever position ithas been tilted to.

To secure the spindle with the seat thereon and the nut D to the hub A,the nut D is preferably provided with an annular flange H at its lowerextremity, and a housing or guard, preferably in two parts I I, isprovided, which is secured to the top of the hub A conveniently byscrews K K and is so constructed as to overlap the flange H, permittingof the free'rotation of the nut D on the hub, but preventing its escapetherefrom. If desired, antifriction-balls L L may be placed in anannular groove or grooves in the nut L and hub A or one of them aboutthe spindle O, to obviate as much as possible the friction between thenut and the hub.

In the form of construction shown in Fig. 4 a modified form of stop F isshown, which consists of a screw-threaded pin turning by its threadthrough the nut D into the vertical groove Gin the spindle, the stop Fbeing in this instance employed in the place of the swinging latch orstopF of the form shown in Figs. 1, 2, and 3. In this form ofconstruction the fingers E E are omitted, the nut D being shown asprovided with an annular contraction and shoulder M, adapted to receivethereon a hand-wheel or spanner for conveniently rotating the nut orholding it against rotation when the spindle is being rotated therein,though in factthe hand-wheel or spanner are not necessary parts of thecon struction, as the nut may be otherwise held against rotation,whilethe spindle is being rotated therein, conveniently by taking hold of thechair-seat thereon.

What I claim as my invention is- 1. A chair-iron for a revolving chaircomprising a pedestal-hub having a smooth vertical bore, ascrew-threaded spindle fitted and revoluble in the bore of the hubwithout regard to its screw-thread, said spindle being provided with alongitudinal groove, a nut turning on the spindle by its screw-thread, alatch or stop mounted in the nut and entering the groove of the spindlepreventing revolution of the nut or the spindle with reference to eachother, and means holding the nut and spindle to the hub but permittingrevolution thereof.

2. In a revolving-chair iron, the combination of a pedestal-hub having asmooth vertical bore, a screw-threaded spindle freely revoluble in thebore of the hub without regard to its screw-thread, a nut turning byitsscrewthread on the spindle and resting revolubly on the hub, and a stopmounted in the nut and entering releasably a recess or groove thereforin the spindle.

In a revolving-chair iron the combination with a hub having a smoothvertical bore and a screw-threaded spindle fitted and revoluble in thehub without regard to its screwthread, of an integral screw-threaded nutturning and adjustable on the spindle, said nut having integral enlargedradially-projecting members at the top and an enlargedradially-projecting annular flange at the bottom, and a guard or housingin a plurality of parts secured to the hub and overlapping the flange ofthe nut at the bottom thereof.

In testimony whereof I affix my signature in presence of two Witnesses.

CURTIS T. BENEDICT.

Witnesses:

ANNA V. FAUST, (/rmnnns H. KEENEY.

